Gyrolite on Prehnite (ex Kay Robertson Collection)

Item Description

An attractive and fine quality specimen featuring white spherical groups of Gyrolite measuring up to 3 mm beautifully sprinkled on translucent colorless crystallized Prehnite free of matrix. The Prehnites appear to have formed "finger"-shaped "casts" after a preexisting mineral like Anhydrite or Glauberite. The piece is in great shape all around and displays well from a few angles. Gyrolite is an UNCOMMON silicate (it's actually the namesake of the Gyrolite Group) and pieces from the Bombay area quarries are some of the finest examples of the species exant. The Bombay area quarries are closed, due to population growth. Ex Kay Robertson Collection (#7063). Kay is a prominent California collector, who specialized in European classics (see the article in the March-April, 2007 Mineralogical Record and the 50+ page article in the German Magazine "Mineralien Welt" November-December 2017).